package com.cucn.educenter.controller;

import com.cucn.commonutils.JwtUtils;
import com.cucn.educenter.entity.UcenterMember;
import com.cucn.educenter.service.UcenterMemberService;
import com.cucn.educenter.utils.ConstantWxUtils;
import com.cucn.educenter.utils.HttpClientUtils;
import com.cucn.servicebase.exceptionhandler.GuliException;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @author KouChaoJie
 * @since: 2021/10/11 15:52
 */
//@CrossOrigin
@Controller
@RequestMapping("/api/ucenter/wx")
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    /**
     * 生成微信登录扫描的二维码
     *
     * @return 重定向微信请求地址
     */
    @GetMapping("/login")
    public String getWxCode() {
        //固定地址,后面需要拼接参数
        // 微信开放平台授权baseUrl,%s相当于占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect进行urlEncode编码
        String redirectUrl = ConstantWxUtils.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl, "UTF-8");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }

        //拼接参数
        String url = String.format(
                baseUrl,
                ConstantWxUtils.WX_OPEN_APP_ID,
                redirectUrl,
                "cucn"
        );

        //重定向到请求微信地址
        return "redirect:" + url;
    }

    /**
     * 获取扫描用户信息,添加数据
     *
     * @param code  类似验证码,随机唯一值
     * @param state 原样传递的一个值
     */
    @GetMapping("/callback")
    public String callback(@RequestParam String code, @RequestParam String state) {
        try {
            //1.获取code值,临时凭证,唯一随机值

            //2.拿着code请求微信给的固定地址,得到两个值access_token和openid
            //向认证服务器发送请求换取access_token
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            //拼接三个参数:id 密钥 code值
            String accessTokenUrl = String.format(
                    baseAccessTokenUrl,
                    ConstantWxUtils.WX_OPEN_APP_ID,
                    ConstantWxUtils.WX_OPEN_APP_SECRET,
                    code);
            //请求这个拼接好的地址,得到返回两个值access_token和openid
            //使用httpclient发送请求,得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);

            //从accessTokenInfo取出access_token和openid
            //因为json字符串,把accessTokenInfo转换成map集合,根据map里面key获取对应值
            //使用gson转换accessTokenInfo
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String accessToken = String.valueOf(mapAccessToken.get("access_token"));
            String openid = String.valueOf(mapAccessToken.get("openid"));

            //把扫码用户信息添加到数据库里
            //判断数据表里是否存在该用户信息
            UcenterMember member = memberService.getOpenIdMember(openid);
            if (member == null) {
                //3.拿着得到access_token和openid,再去请求微信提供的固定的地址,获取到扫码用户的信息
                //访问微信的资源服务器，获取用户信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                //拼接参数
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        accessToken,
                        openid
                );
                //使用httpclient发送请求,得到返回的用户信息
                String userInfo = HttpClientUtils.get(userInfoUrl);

                //获取返回userInfo字符串扫码用户信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                //头像
                String nickname = String.valueOf(userInfoMap.get("nickname"));
                //昵称
                String headImgUrl = String.valueOf(userInfoMap.get("headimgurl"));

                //如果member为空则没有相同微信数据
                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headImgUrl);
                memberService.save(member);
            }

            //根据jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            //返回首页面,通过路径传递token字符串
            return "redirect:http://localhost:3000?token=" + jwtToken;
        } catch (Exception e) {
            throw new GuliException(20001, "登录失败");
        }

    }
}
